Machine for sharpening cutlery



Jam E5 1924.

J. W. STEIN ET Ai..

MACHINE Fon SHARPENING GUTLERY Filed dan. 19 1921 3 Sheets-Sheet 1 A ITO/m5 y' Wl N555 Jan. 15, 1924. 1,480,791

J. W. STEIN ET L MACHINE FOR SHARPENING CUTLERY Filed dan. 19. 1921 3 Sheets-Sheet 2 l @MTM/EY Jan.l 15 1924.

J. W. STEIN ET AL MACHINE FOR SHARPENING CUTLERY Filed dan. 19, 1921 3 Sheets-Sheei;l 5

ATTORNEY Patented Jan. 15, 1924.

Unirse sraras fiscaal aniram orifice.

JULIUs w. s'rnrN AND EMIL BUCHMAN, or Nnw'vonx, N. Y.

MACHINE FOR SHARPENING GUTLERY.

, Application filed January 19, 1921. Serial No. 438,404.

To all wlw/m t may concern.' v Be it known that we, JULIUs W. S'rEI and EMIL BUOHMAN, citizens of Poland, and residents of New York city, in the county of Bronx and State of New York, have invented a certain new and useful Improvement in Machines for Sharpening Cutlery, of which the following is a full, clear, and exact description. 4 t v Among the principal objects which the present invention has in view are: to auto-V matically grind the cutting edgeof knives or other cutlery; to grind the opposite sides of a blade successively, the grinding members operating against said blades in the same relative direction; to reciprocate the blades during the process of grinding to form an even edge on thecutlery, to provide a machine which will perform its operations on blades of various lengths and styles; to operate the machine by hand or motor at will; and to simplify the construction and arrangement of the machine.

Drawings.

Figure 1 is a plan view of a machine of the character mentioned, constructed and arranged in accordance with the present invention. n v f Figuref2 is a side view of the same.

Figure 3 is a vertical section, the sectionV being taken as on the line v3---3 in Fig. 1. Figure 4 is an endview of the machine. Figure 5 is a cross section, the section being taken as on the line 5-5 in Fig. 1.'

Descrip tion.

' ably raised up from a bedplate 14fupon which the various mounted.

The bearings 13 are preferably bracket parts of the Vmachine are extensions of the brackets 15. The brackets 15 support bearings for the driving and driven shafts 16 and 17 respectively. The

shafts 16 and 17 are operatively connected by pinions 18 and the large gear wheel 19. The ratio between the wheels 18 and 19 establishes the relative speeds at which the two shafts 16 and 17 are rotated, the object being to diminish the speedy in the transmission from the shaft 17 to the shaft 16. An increase in the relative speeds between the shaft 17 and the shafts 11 is provided in the disproportion lof the bevel wheels 20 and their associated pinions 21, the latter beingv considerably smaller to impart to the shafts 11 and the wheels 10 mounted thereon, a very high rate of rotary speed.

The shaft 17 is furnished with a pulley y22 by means of which if desired the shaft 17 may be directly driven from an inde-l pendent prime mover a belt 23 as shown in Fig. 1 of the drawings, being employed for connecting the said pulley and prime mover. The rate of speed by which the grinding wheels 10 arey driven, insures the proper grinding of a blade 24 whenever the same is held in contact with either of the grinding wheels. Blades such as indicated by the numeral 24 are held in a spring vise 25 which is pivotally mounted by the shaft 26 in the ends of a yoke 27. The yoke 27 isslidably mounted on a rectangular guide bar 28 and is reciprocated thereon by means of a con` necting rod 29. The rod 29 is pivotally connected by the screw bolt 30 to an adjustable extension arm 31 which'is slidably mounted in the crank arm 32. set screw 33 normally maintains the position of the extension arm 31 in the crank arm 32. The arm 32 `,is cranked b v the shaft 16 on which it is rigidly mounted.v

'As the shaft'16is -driven from the shaft 17 through the intermediary of the pinion 19 and gear wheel 18 lthe rotation of the said 'shaft 16 and of the arm 32 connected therewith is relatively slow therefore the movement of the vise 25 and ofthe blade 24 held therein, is likewise slow, as compared with the rotation of `the wheels 10. By means of the extension arm 31 the lengthof the movement of the vise is governed. This is so arranged that the blade 24 is completely turned to present the edge to one or other of the wheels 10 before the end of the blade comes in contact therewith, and so as to maintain the same contact with the said wheel during the entire advance or recession of the said blade. To rock the vise 25 and blade 24 held therein, the vise 25v has laterally extended link yarms 34 at the ends whereof are formed elongated openings 35. The openings 35 extend in guide shafts 36 as best seen in Fig. 3 of the drawings. The

shafts 36 are parallel and extend between the rocking cradles 37 and 38, one of `which is situated at the opposite extremities of the path provided for the vise 25.

rlhe cradles 37 are pivotally mounted on standards 39 by means of pivoted shafts 40. rlhe structureY including the cradles 37 and A38 and the shafts 36, is rocked by means of the beater arms 42. The arms 41 and 42 each have a pipe roller 43 at its outer end which engage the extension 44. The eXtenysions 44 are structurally united with the wheel in the various-operations, is constant.

The beater arms 41 and 42 are pivotally mounted on a shaft 45 which has bearings in standards 46. The inner endsV of the arms 41 and 42 have each a foot 47 which is disposed-sopas to engage each one of the tappets 48 which are mounted on the shaft 16.- The tappets 48 correspond in number to the arms 41 and 42 and are extended in relatively opposite directions so astormove the arms 41and42 successively and at equal intervals.

When `a machine is operated whether driven by hand or-byf power, the` shattl is. slowly rotatedy tocrank the arm 32`and extension 31 thereon, with theV result that the connectingiod 29 andthe yoke 27 `connected therewith are reciprocated lengthwise ofthe bar 28 and of the'shafts 36. Correspondingly, the vise 25 and blade 24 mounted therein, is reciprocated. rlhe length of the reciprocation desired is'arranged for by releasing the ,screws 3,3` and adjusting the arm 31 in the arm 32. At eachl extremity of the t-hrowv or reciprocation of the vise-2,5 due to the function ofA a crank, thev said vise is held relatively stationaryV or with very little movement. It is during these periods offrest,or while the` ends of the crank arm is passing the dead centers that-the tappets 48 influence one or other-of the beater arms 41 and 42 to rock the cradle 37 and structure associated therewith, embodying the cradle 38 and the guide shafts 36. By this meansV there is insured thatatthe beginning of each reciprocatory movementy of thevise 25, the cutting edge of .the blade' 24 has beenmoved trom the pathof ,one or the other of the said wheels.

The result of thisA operation is that each side of the cutting edge ot the bla-de 24 is ground to the same degree at the completion of the operation.

While we have indicated and described the attachment ofthe present machine to a motor by means of the belt 23 and pulley 22, it will be understood that any suitable motor and any suitable transmission could be'employed. Also it will be understood that the ratio of speed Vbetweenthe shaft 17 and the shafts 11 and wheels 10 mounted thereon ii'iay be varied to increase or' diminishy the rate of peripheral speed of the said wheels 10.

Claims.

1. A machine as characterized comprising a rock-ing cradle; a vise slidably mounted in a rocking cradle; avise slidably mounted in said cradle; a plurality of abrasive members disposed at opposite sides or saidcradle; means for reciprocatingsaid visev lengthwise of said cradle; and means for rocking said cradle during the intervals betweenthe i'ecipi rocatory movements oi said reciprocating mechanism. Y

3.- A machine `as characterized comprising` a rocking cradle; a vise slidably mounted in said cradle; a plurality oia abrasive members disposed at opposite sides or" said cradle; means for reciprocating said vise lengthwise of said cradle, said means embodying a rotaryr crank arm and a connecting rod, a rod operatively connecting said vise and said crank arm, and means for rotating saidcrank arm; and means operatively connected with said crank `arm for' rocking said cradle toward saidvr abrasive members alternately and in correspondence with the vmovement of said crank arm and during the periods when the same isy passing the dead centers thereof.V

J'Uiilts w. sra-ni. EMIL vinici-mau.

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